I'm at about 2000 miles on an '05 Auto HCH. My MPG has remained around 40-41. I do mostly to/from work (13 miles) stop and go plus short spurts on the hi-way and have several hills to deal with which makes it difficult to increase my MPG. Before the last tank I increased the tire pressure from 30 to 35 psi. The mileage on this tank (180 or so miles) is hovering between 47 and 48 MPG (per the guage, which I believe to be a bit overstated). I hesitate to go much higher being concerned with tire wear and traction - mostly traction. I hear of folks at 40 psi and above and wonder how tire wear and traction are effected ??